Amazon Cloud Recharge Channel: AWS Security Hub Scans for High-Risk Compliance Vulnerabilities? Common Security Compliance Item Remediation Guide
As a person in charge of operation and maintenance who deals with cloud architecture and system security on a daily basis, one of the most frightening moments is to open the console in the early morning and see
AWS Security Hub
red on the interface
CRITICAL (emergency)
or
High (high risk)
Alarm.
In the current compliance supervision system of enterprises, whether it is PCI-DSS, CIS AWS Foundations Benchmark or CIS Controls,Security Hub is like a strict "cloud examiner". It scans all of your AWS resources around the clock, and if it finds a configuration that does not comply with best security practices, it will immediately label it as a compliant vulnerability.
These high-risk vulnerabilities not only expose companies to the risk of failing audit compliance, but also leave a backdoor to data breaches, ransomware attacks, or malicious exploits.
This article will sort out the Security Hub scans for you from a real operational perspective.
Four high-risk common compliance vulnerabilities
, provide a hands-on, landing repair guide, and talk about the underlying financial defense line to ensure the security and normal operation of resources on the cloud (including
AWS Account Top-Up
strategy).
1. understanding of Security Hub's criteria and risk ratings
Before we can fix it, we need to understand how the Security Hub conducts compliance assessments.
The Security Hub performs automated checks based on the following types of security standards (Security Standards):
AWS Foundation Security Best Practices (FSBP): Officially recommended security best practices for AWS.
CIS AWS Foundations Benchmark: The industry-wide AWS security baseline standard.
PCI-DSS / NIST / HIPAA: Industry-specific compliance standards such as financial payments, healthcare, etc.
After the detection of each compliance rule fails, the Security Hub classifies the risk level according to the potential impact of the vulnerability:
Critical (emergency), High (high), Medium (medium), Low (low)
.
[AWS Security Hub Monitoring Console]
│
[Critical/High Vulnerability Found]
│ │
│ ├─ ► S3 Bucket Common Access Exposure
│ ├─ ► IAM Root / Admin Lack of MFA
│
├─ ► Security Group 0.0.0.0/0 High-risk Port Release
│-► CloudTrail / VPC Flow Logs Audit Not Opened
│
The ─ ► [in-depth investigation and automated repair]
2. 4 Common High-Risk Compliance Vulnerabilities and Hands-on Fix Guide
According to the AWS security audit experience of a large number of enterprises, the following four types of vulnerabilities occur very frequently in Security Hub, and most of them are marked
HIGH
or
CRITICAL
.
1. S3 bucket has public read/write permissions turned on (S3.2 / S3.3)
Risk Level: CRITICAL / HIGH
Vulnerability description: Block Public Access is not enabled for an S3 bucket, or the bucket policy/ACL allows the Principal "*" read or write. Numerous enterprise sensitive data breaches are rooted in this.
Repair steps:
Method A: Turn on Block Public Access at the bucket level"
Open the AWS S3 console and find the marked bucket.
Click the Permissions (Permissions) tab.
Click Edit in the Block public access (bucket settings) area.
Check Block all public access, click Save and enter the confirmation command.
Method B: One-click repair using the AWS CLI
Bash
aws s3api put-public-access-block \
-- bucket <your bucket name> \
--public-access-block-configuration "BlockPublicAcls=true,IgnorePublicAcls=true,BlockPublicPolicy=true,RestrictPublicBuckets=true"
Operation and maintenance suggestion: It is recommended to directly open Block Public Access globally at the AWS Account / Organizations account level to prevent developers from mistakenly creating public S3 buckets.
2. The IAM root account (Root User) does not have MFA enabled or uses the root account for daily operations (IAM.1 / IAM.6)
Risk level: CRITICAL
Vulnerability description: R of the AWS account
Once the password is leaked and there is no multi-factor authentication (MFA) protection, the attacker can instantly take over the entire AWS account and even destroy all data.
Repair steps:
To bind MFA to the root account: Log in to the AWS root account and go to the IAM console. Click the Dashboard on the left and find Root user MFA in the Security recommendations. Click Add MFA, and it is recommended to select Virtual MFA device (such as Authenticator App) or FIDO hardware security key.
Lock the root account and disable the Access Key: Check whether the root account has created an Access Key / Secret Key. If so, immediately delete. The root account is reserved for use only in a few emergency management scenarios (such as changing the payment method and canceling the account). The daily operation and maintenance must be authorized through IAM Identity Center (SSO) or IAM Roles.
3. The security group allows high-risk port access of 0.0.0.0/0 (EC2.2 / EC2.19)
Risk level: HIGH
Vulnerability description: The inbound rule maps 0.0.0.0/0 (network-wide public) to sensitive management ports, such as TCP 22 (SSH), TCP 3389 (RDP), database ports TCP 3306 (MySQL), TCP 5432 (PostgreSQL).
Repair steps:
Open the EC2 console-> Security Groups and search for the security group ID mentioned in the Security Hub alert.
Edit Inbound rules: Delete the 22/3389 rule with a Source of 0.0.0.0/0. Change the source of the management port to the company's fixed egress public network IP /232 or VPN network segment. For database ports, change the Source to only allow traffic connections from web/application tier security groups (using Security Group ID nested references).
Best practice: Give up direct public SSH login to EC2 and fully switch to AWS Systems Manager (SSM) Session Manager. SSM can securely connect to the server without opening port 22 or requiring a public IP address.
4. CloudTrail global audit logging is not turned on (CloudTrail. 1 / CloudTrail. 2
)
Risk Level: HIGH
Vulnerability description: The CloudTrail does not configure logging for all regions (multi-region trail), or does not enable log file integrity verification (log file Integrity Validation). This means that intruders will not be able to leave log traces when they do malicious operations in an area that is not enabled.
Repair steps:
Go to the CloudTrail console and click Trails -> Create trail.
Enter the Trail name and select the Enable for all regions.
In the Storage location, configure log delivery to an encrypted S3 bucket.
Select the Log file validation (Log file verification) to ensure that the log is tamper-proof.
Enable additional KMS encryption to ensure the security of log storage.
The "bottom line of defense" for 3. cloud security and infrastructure operations: account funding and compliance
In daily security operation and maintenance, many technicians focus 100 of their energy on code vulnerabilities, network security groups and IAM permission control, but often ignore an equally fatal hidden danger that is often hidden outside the technology--
Risk of cloud service outage caused by AWS account credential failure or fund outage
.
Suppose such a scenario: you have just completed the full set of compliance governance of Security Hub, but due to the failure of the payment method bound to the AWS account or the insufficient credit card limit, the account is in arrears (Overdue).
What happens when an AWS account is suspended or restricted due to arrears?
Security service degradation and log disconnection: Some security services that rely on dynamic scheduling (such as GuardDuty threat detection, CloudTrail real-time log delivery, and Hub-Security automated detection) may have log delays or suspensions due to API access restrictions, resulting in a blank period for security monitoring.
Automated repair script failure: If your team deploys the automatic repair process (Auto-Remediation) based on EventBridge + Lambda, the limited account service may directly cause Lambda execution failure, and the vulnerability cannot be blocked at the first time.
Malicious use of defense reduced: accounts in an abnormal state are more likely to be attacked by hackers using black channels. If hackers use loopholes to illegally mine encrypted currency (Crypto-Mining) in your account, huge bills generated instantly may make the account risk even worse.
Enterprise's AWS Funding and Defense Strategy:
Establish a perfect AWS billing alarm (AWS Budget
S): Configure budget alarm in Cost Management. When the consumption reaches the expected 50%, 80% and 100, SNS will trigger email and DingTalk/flying book notification.
Smooth enterprise-level recharge and payment channels: For overseas enterprises or large multinational sites, there is a great risk of relying only on employees' personal credit cards to bind AWS accounts (e. g. card expiration, bank wind control buckle, etc.). Enterprises should establish a formal and continuous AWS account recharge mechanism, such as public-to-public recharge and public settlement through AWS officially recognized partners (AWS Partner), or apply for AWS Enterprise Agreement(EA Agreement) account period, so as to fundamentally eliminate cloud service risks caused by fund interruption.
Separation of management account and business account: With the help of AWS Organizations, the main payment account (Management Account) is separated from the security account (Security/Production Account) for specific business operations. The main account is only responsible for consolidated billing and unified AWS account recharge, isolating the impact of fund risks on the business security environment.
4. Summary and Security Governance Checklist
AWS Security Hub is not a one-time tool, but an ongoing monitoring system. In the face of frequent refreshing high-risk warnings, the operation and maintenance team should establish a closed-loop mechanism of "troubleshooting-repair-verification-automation prevention.
Finally, summarize a daily/weekly compliance inspection list for you:
Check item
Target Requirements
Repair Priority
S3 Bucket Access
Open full account Block Public Access
P0 (emergency)
**Root account protection**
Turn on MFA and disable Access Key
P0 (emergency)
Security group high-risk port
Plugging 0.0.0.0/0 to 22/3389
P1 (High)
Audit and Monitoring
Enable CloudTrail region-wide log and KMS encryption
P1 (High)
Funding and Service Compliance
Set up bill alarms to ensure smooth recharge channels for AWS accounts.
P1 (High)
Security on the cloud is no small matter. Security compliance is not only responsible for enterprise data assets, but also the cornerstone of ensuring the stable, continuous and efficient operation of the business on a global scale!
